alias: add "grih" for interactive upstream rebase
alias: gke: replace external script with its value
alias: forgot to rename old "gcd" aliases to "gct"
alias: rename "gcp" cherry-pick aliases to "gcy"
alias: don't need a shell function for "glp" alias
alias: use POSIX process substitution $() over ``
alias: add continue, abort, skip for git merge
alias: rename "gcy" to "gy" for git cherry-pick